Hydrogen and things that come around it

[deleted-301861]

Hello!
The last couple of day I started to tinker in my mind this element and I could not find a satisfying answer for my questions...
1. If we take the Big Bang for granted it is stated, that hydrogen is a by product of it. But given the nature of hydrogen, isn't it more believable this element was present before that, and combusted by some factor? When I thinker whit that idea, a Big Bang caused by combusted hydrogen, would create (by heating up, expanding and colliding) and destroy until the density of hydrogen itself would get significantly lower.
2. A star is hydrogen in plasma state with high gravitational pull. If I try to trace the reasons why the stars "do this", it comes to my mind that elements that are higher on the periodic table have greater mass, and the hydrogen plasma should be only on the "surface". In the very center of the star, all elements should be present and the very core should be something element with immeasurable density. Near to the bottom periodic table. This would also mean that an collapsed star, that turns into a black hole is would also have the basic structure of an star, but with that higher density and its very center, there is an element, that has more density and mass than an galaxy.

I am sorry if I am not following rules by posting my two questions like this. And I would like to receive an simple question. I lack the academical knowledge needed to find and understand on my own. Thank you in advance.

[deleted-71603]

Hello. Is this question related to a science fair project? This forum is specifically intended for students who need help with a project for a school science fair.

If it is a science fair project, tell us more about it. If this is a question for homework or other purposes, this is not the appropriate forum.

Cheers.